Wire-drawing die.



L. C. BELZ & A. NACKE.

WIRE DRAWING DIE. APPLICATION FILED MAR. 24. 1914.

Patented Dec. 7, 1915.

coLuMBXA FLANOOMPH c0. WASHINGTON n c UN 11% AWN N UFlfi LOUIS C. BELZAND ARNOLD NAOKE, OF PHILADELPHIA, PENNSYLVANIA, ASSIG'NORS TO THETRI-PBONG HAIR PIN 00., A CORPORATION OF NEW JERSEY.

WIRE-DRAM ING DIE.

Specification of Letters Patent.

Patented Dec. '7, 1915.

Application filed March 24, 1914. Serial No. 826,875.

To all whom it may concern:

Be it known that we, LOUIS C. BELZ and ARNOLD NAOKE, citizens of theUnited States, and residents of Philadelphia, county of Philadelphia,and State of Pennsylvania, have invented an Improvement in ire-DrawingDies, of-which the following is a specification.

Our invention has reference to wire drawing dies adapted for use, amongother purposes, in making drawn wire suitable for making tri prong hairpins of the construction set forth in Letters Patent No. 1,026,142,granted May 1 1, 1912, and for use in the method of drawing wiretherefor set out in application Serial No. 755,059, filed on March 17,1913, by Louis C. Belz, one of the present applicants. It will beunderstood that the said dies are also suitable for drawing wheel spokesor for other purposes where two or more diameters or cross sectionalareas are required in' a given length.

The object of our invention is to provide a two-part wire drawing diefor making articles of wire which have a portion of their length reducedin diameter so'that the com pleted article is formed of a wire havinglengths of different cross sectional areas, and which die is so designedand constructed as to automatically remove the fin or fins formed duringthe initial pinching action of the, dies whereby the material leaves thedie in a substantially finished condition and without fins or roughedges usually formed by the action of a drawing die.

It has for a further object to provide a means for limiting the clampingactionof the dies so that the cutting devices for sever-.

ing the'fins or rough edges are protected from damage during theoperation of the die.

Our invention consists of a two-part drawing die having thethroatportions pro: vided with cutting edges which during the initialreduction of the wire trim or remove the lateral fins produced; furtherin producing the die parts with means to limit their approach to preventcrushing of the cutting edges. v

Our invention also comprehends details of construction which, togetherwith the features above specified, will be better understood byreference to the drawings, in which z- Figure 1 represents an endelevation of a 'the die drawing and cutting invention; Fig. 2 representsa similar eleva- 'tion of a die showing a modified construction; 3represents a section on line m--w of Fig. 1; Fig. 41 represents a planof the face of one of the die parts shown in Fig. 1; F1932. 5 representsa transverse section of parts showing the material within the die andthe severed fins at each side thereof; Fig. 6 represents an endelevation of a two part die embodying our invention for drawing an ovalshape, and showing another embodiment of the fin cutting means; Fig. 7represents an end elevation of a two part die embodying our inventionfor drawing a rectangular shape, and showing another embodiment of thefin cutting means; and Fig. 8 represents a side elevation, partly insection, of a machine for drawing wire through the dies.

The wire drawing die forming the subject matter. of the presentinvention is made in two parts, 1 designating the lower die part and 2the upper die part, and in the form construction, as will be readilyseen.

3 designates a groove cut in the surface of each die part atsubstantially the center thereof and extending longitudinally from oneside of the part to the other so that when the two parts of the die aresuperposed in operative relation, the grooves of each will form togethera hole of the diameter corresponding to which the wire is to be drawn.By reference to Fig. 3 it will be seen that the longitudinal section ofthe groove 3 issubstantially an arc of a circle so that when the partsof the die are closed the aperture formed by these two grooves will haveits side walls converging from each side of the die toward the center,thus forming an entrance opening at the. side of spect to each other asshown at 5, whereby a definite cutting edge is formed extending the icethe wire. At the outer side of the recesses 7, and at each s de of thedie, the material.

of the parts is suitably. surfaced as shown at 8 to form contactingabutments for the two partsof the die in order to limit the closing ofthe parts and thus prevent the cutting edges 4: from unduly pressing oneupon the other and damaging the said cutting edges.

In Fig. 2 we have shown a modified form wherein the lower die part 1 isprovided with a flat anvil surface 9 at each slde of the groove 3andalso has the longitudmal recesses- 10 therein for the reception ofchips and" the like. The die part 2 is, however,

formed similar to one of the die parts shown in Fig. 1, having thecutting edges at 4: and

-curved faces 5 diverging from the anvil portion and forming a part ofthe recess 7 as in the die described in Fig. 1. The abutrnents in thismodification are-also similar to those described in Fig. 1, and aretherefore denoted by the same reference nu- Ineral 8.

' InFig. 6 we have shown the die parts 1 and 2 provided with grooves 11which, when superposed, provide an oval shaped channel, capable ofreducing the wire to an oval shape during the drawing operation. In

.this modification the two parts ofthe die are preferably duplicates andtherefore the description of one part will be understood as applying tothe other.

Adjacent one side of the groove 11 the part 1 is provided with an anvilsurface 12, also preferably with a longitudinal recess 13 to receive thechips and the abutment bearing surface 14', while that portion of thedie on the opposite side 'of. the groove 11' is provided with a cuttingedge 15 from which the material curves outwardly as shown at 16 into therecess 17. In this construction the cutting edges 15 out upon the anvilportions 12.' At the outer sides of said recesses the die parts are pro-3 'vided with the'abutme'nt portions 14, as 1n the cases previouslydescribed.

, In ,Fig. .7 the die parts are provided with [a groove 18 shap jed'toform a rectangular drawing of the wire,-and one of the parts is providedwithanvil surfaces 19 at each side of the opening, while the oppositepart has cutting edges 20 with the surfaces curved away in convex formas shown at 21. The

two parts of thedie are recessed to form the clearance openings 22 forCl1lPS,&S already described.

- ing.

In Fig. 8 we have shown the die parts 1 and 2 mounted within a suitablebox 23 on the machine frame 24 and forced together upon the wire throughthe medium of the screw 26 designates the clamping head of the machinefor holding the end of the wire, and the said head is operated, in thepresent instance, by way of example, by being attached to a feed screw27 which may be operated by the hand wheel 28, in which it is screwed.In the operation and use of the die forming the subject matter of ourinvention, it will be noted that the same is more particularly adaptedto drawing wire into lengths of different cross sectional area, eitherin a strand of determined length or in a continuous length of material.

In drawing operations as heretofore carried out, the initial compressionor biting of the parts of a die upon the material causes the same to finor expand laterally, which fin or fins must be chipped or broken off bya separate operation after the completion of, or at least after theinitial drawing operation. The result of removing the fins in thismanner is not satisfactory for the reason that the material is left witha rough or uneven surface where the fin has been removed, which rendersthe completed article defective to a degree. This is particularly thecase where the drawn wire is used for hair pins as the rough line oredge catches in the hair and interferes with the free operation of thepin. Furthermore, there is considerable uncertainty in the removal ofthese fins and this necessitates the expense of inspection and loss fromimperfections. In our present invention, while such fins are necessarilyformed during the initial pinching or biting of the die, the said finsare simi'iltaneously severed from the material by the action of thecutting edges 4 so that when the material is drawn through the die thesurface at the beginning of the reduction has a uniform smooth finish,the severed fins or chips dropping into the recesses at the side of thedie open- Furthermore, since the fins are removed by the initial drawingstep, thc heretofore secondary step of the fin cutting is entirelyeliminated and the wire or article drawn from the die is in asubstantially finished condition.

While we have in the accompanying drawings shown the abutments as a partof the die, it will of course be understood that we do not wish to belimited to this exact construction, as obviously such abutting surfacesmight be otherwise provided to accomplish the same end.

Furthermore, we do not desire to be restricted to the provision ofrecesses or clearance spaces within the die parts for the reception ofchips, and the construction shown is merely the preferred one for thepurpose.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is 1. A two-part wire drawing die, providedwith abutment surfaces to limit the movement of the die parts towardeach other under clamping action, said parts being also respectivelyprovided with a tapered groove forming an opening for drawing thematerial, and one of said die parts having a cutting edge formed ateither side of its groove whereby the fin or fins formed during theinitial clamping of the die is severed.

2. A two part wire drawing die, provided with abutment surfaces to limitthe move ment of the die parts toward each other under clamping action,said parts being also respectively provided with a tapered grooveforming an opening for drawing the material, a cutting edge formed onone of said parts at either side of said opening whereby the fin or finsproduced during the initial clamping of the die is severed, one of saiddies having a clearance space at each side of the drawing opening toreceive the severed fin or chips.

3. A two-part wire drawing die having its parts each formed with atapered groove, said groove opposed to provide a tapered opening andsaid die also having means arranged in alinement with the sides of thegrooves to sever a fin formed between the die parts in the initialclamping operation, and further with abutment portions to limit theapproach of the two parts of the die and clearance spaces for the finson each side of the opening and between the abutment portions and thesevering means.

4:- In a wire drawing mechanism, the combination of a die formed of twoparts relatively movable toward each other and providing a taperedgroove with cutting edges at the juncture of the die parts adjacent tothe groove, means for drawing a wire strand through the die and betweenthe two portions thereof, and means for closing the two die portionsupon the wire strand, and holding them closed during the drawing of thewire strand through the die and between the portions thereof, the saiddie parts compressing the strand and severing a fin or fins formed onsaid material during the initial clamping of said die parts.

5. In a device of the character stated, a

frame, a clamping member mounted thereon,

a two-part wire drawing die adapted to be operatively held by saidclamping member, said die being provided with abutment surfaces to limitthe movement of the die parts toward each other under the action of saidclamping member, said die parts being also respectively provided with atapered groove forming an opening for drawing the material and one ofsaid die parts having a cutting edge formed at either side of its groovefor severing the fin or fins formed during the initial clamping of thedie, and means to grip and draw the material through said die.

In testimony of which invention, we hereunto set our hands.

LOUIS C. BELZ. ARNOLD NACKE. Witnesses:

H. A. CANNON,

AN DREW HELDRICH.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

